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Basis of Presentation and Summary of Significant Accounting Policies - Narrative (Details) - USD ($)
 3 Months Ended 9 Months Ended
Sep. 30, 2025
Dec. 31, 2024
Sep. 30, 2024
Mar. 31, 2024
Sep. 30, 2025
Sep. 30, 2024
Jun. 30, 2025
Business Combination [Line Items]              
Allowance for doubtful accounts $ 82,000,000 $ 71,000,000     $ 82,000,000    
Goodwill, impairment loss         0    
Goodwill, accumulated impairment loss 0       0    
Foreign currency translation loss 53,000,000   $ 22,000,000   117,000,000 $ 75,000,000  
Defined benefit plan, actuarial gain (loss), immediate recognition as component in net periodic benefit (cost) credit       $ (63,000,000)      
Defined benefit plan, cost of providing special and contractual termination benefits   20,000,000          
Pension and other postretirement benefits expense (reversal of expense), noncash   147,000,000          
Defined benefit plan, funded (unfunded) status of plan             $ 43,000,000
Merchants Utilizing Clover Capital Cash Advance Program              
Business Combination [Line Items]              
Cash advances 544,000,000 397,000,000     544,000,000    
Allowance for credit loss, current 31,000,000 16,000,000     31,000,000    
Merchant credit losses              
Business Combination [Line Items]              
Collateral held 605,000,000 598,000,000     605,000,000    
Aggregate merchant credit loss expense 32,000,000   $ 24,000,000   93,000,000 $ 77,000,000  
Loss contingency accrual $ 44,000,000 $ 40,000,000     $ 44,000,000